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5, 7-Disubstituted 8-methoxyquinolines were brominated at C-3 position. The palladium-catalyzed cross-coupling of obtained 3-bromoquinolines with phenylboric acids gave corresponding 3-arylquinolines from which a substituted 11H-indolo[3,2-c]quinoline could be synthesized.
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Trécourt et al. (1995) studied this question.
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